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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance $ 3,045   $ 3,045   $ 6,411
Impaired loans without a valuation allowance, Outstanding Balance 16,706   16,706   20,499
Impaired loans, Outstanding Balance 19,751   19,751   26,910
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,289   3,289   6,683
Impaired loans without a valuation allowance, Unpaid Principal Balance 17,022   17,022   20,815
Impaired loans, Unpaid Principal Balance 20,311   20,311   27,498
Impaired loans, Valuation Allowance 474   474   578
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 4,528 $ 8,146 5,630 $ 8,601  
Impaired loans without a valuation allowance, Average Outstanding Balance 16,840 21,957 17,629 22,478  
Impaired loans, Average Outstanding Balance 21,368 30,103 23,259 31,079  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 34 75 168 263  
Impaired loans without a valuation allowance, Interest Income Recognized 244 301 729 926  
Impaired loans, Interest Income Recognized 278 376 897 1,189  
Total commercial [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 5,703   5,703   9,267
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 6,019   6,019   9,584
Impaired loans, Valuation Allowance 14   14   13
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 7,168 11,785 8,396 12,333  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 88 168 345 511  
Commercial real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 185   185   192
Impaired loans without a valuation allowance, Outstanding Balance 5,319   5,319   5,829
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 185   185   193
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,635   5,635   6,145
Impaired loans, Valuation Allowance 14   14   9
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 188 1,377 190 2,161  
Impaired loans without a valuation allowance, Average Outstanding Balance 5,359 7,013 5,571 6,109  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 3 3 9 66  
Impaired loans without a valuation allowance, Interest Income Recognized 82 121 256 315  
Commercial other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 0   0   2,802
Impaired loans without a valuation allowance, Outstanding Balance 199   199   444
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 0   0   2,802
Impaired loans without a valuation allowance, Unpaid Principal Balance 199   199   444
Impaired loans, Valuation Allowance 0   0   4
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 1,413 3,090 2,299 1,569  
Impaired loans without a valuation allowance, Average Outstanding Balance 208 305 336 2,494  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 35 62 71  
Impaired loans without a valuation allowance, Interest Income Recognized 3 9 18 59  
Total agricultural [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 11,188   11,188   14,189
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 11,188   11,188   14,189
Impaired loans, Valuation Allowance 0   0   0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 11,273 14,733 11,716 14,838  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 159 171 455 563  
Agricultural real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 8,611   8,611   9,538
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 8,611   8,611   9,538
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 0 94 0 737  
Impaired loans without a valuation allowance, Average Outstanding Balance 8,638 9,845 8,569 9,760  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 0 0 0 11  
Impaired loans without a valuation allowance, Interest Income Recognized 116 113 341 378  
Agricultural other [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 2,577   2,577   4,651
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,577   2,577   4,651
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance     0 226  
Impaired loans without a valuation allowance, Average Outstanding Balance 2,635 4,794 3,147 4,115  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized     0 0  
Impaired loans without a valuation allowance, Interest Income Recognized 43 58 114 174  
Total residential real estate [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans, Outstanding Balance 2,860   2,860   3,454
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans, Unpaid Principal Balance 3,104   3,104   3,725
Impaired loans, Valuation Allowance 460   460   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans, Average Outstanding Balance 2,927 3,585 3,147 3,908  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans, Interest Income Recognized 31 37 97 115  
Residential real estate senior liens [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Outstanding Balance 2,860   2,860   3,417
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,104   3,104   3,688
Impaired loans, Valuation Allowance 460   460   565
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans with a valuation allowance, Average Outstanding Balance 2,927 3,585 3,141 3,908  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans with a valuation allowance, Interest Income Recognized 31 $ 37 97 115  
Residential real estate home equity lines of credit [Member]          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Outstanding Balance 0   0   37
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Impaired loans without a valuation allowance, Unpaid Principal Balance $ 0   0   $ 37
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Impaired loans without a valuation allowance, Average Outstanding Balance     6 0  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]          
Impaired loans without a valuation allowance, Interest Income Recognized     $ 0 $ 0